Getting All Tags for each model in CGridView

[larry-tx]

I would like to have a CGridView column that displays all tags for each model listed in the index (list) and admin views. I've tried some thing like this in CGridView:

<?php $this->widget('zii.widgets.grid.CGridView', array(
    'id'              => 'disks-grid',
    'dataProvider'    => $model->search(),
    'filter'          => $model,
    'columns'         => array(
      // additional column definitions
        array(
            'name'   => 'tags_with_model',
            'header' => 'Tags',
            'type'   => 'raw',
            'filter' => FALSE,
            'value'  => $model->tags_with_model->toString(),
        ),
        // ,,,

Unfortunately, that produces nothing. No errors, just a totally blank column. (Interestingly, I was able to use tags_with_model->toString(); ?> to display the tags in view.php, and it worked quite nicely.) Apparently, something happens in CGridView to prevent toString() from working.

By the way, my behavior in the model looks like:

public function behaviors() {
            return array(
                'tags_with_model' => array(
                    'class'                   => 'ext.yiiext.behaviors.model.taggable.ETaggableBehavior',
                    'tagTable'                => 'tag',
                    'tagBindingTable'         => 'disks_tag',
                    'modelTableFk'            => 'disksId',
                    'tagTablePk'              => 'id',
                    'tagTableCount'           => 'frequency',
                    'tagBindingTableTagId'    => 'tagId',
                    'createTagsAutomatically' => TRUE,
                ),
            );
        }

Can anyone tell me how to get a column in CGridView that displays the tags for each model?